|Theurer, J - RETIRED ARS 3635-10-00|
Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: May 1, 1998
Publication Date: N/A
Interpretive Summary: Beet sugar could be produced more economically if sugar beet yields were not reduced when Cercospora leaf spot or Aphanomyces blackroot disease struck, or if fungicide applications were not needed to control the leaf spot disease. EL50 sugarbeets have strong resistances to these costly diseases, as well as some resistance to the Rhizoctonia root rot found in the same fields. It should contribute to hybrid varieties of the future that meet the demand of the sugar producers for disease resistant and environmentally friendly sugar beets. The cost efficiencies resulting from multiple resistance beets are important to sugarbeet farmers and processors because of the reduced expenses to produce sugar in these portions of the beet sugar industry.
Technical Abstract: EL50 is a monogerm sugar beet line combining extremely high resistance to Cercospora leaf spot with moderately high resistance to Aphanomyces seedling and root rot disease, and moderate resistance to Rhizoctonia root rot. EL50 was derived from a pair cross of in vitro shoot culture vegetative propagules of two individual beets selected on the basis of progeny performance for high sugar yield and Cercospora leaf spot resistance from and East Lansing heterogeneous monogerm population developed in the 1970's as part of the Rhizoctonia resistance breeding program. EL50 is diploid and highly self-sterile, although not Type-O. EL50 yielded a sucrose concentration 98 percent of that of commercial cultivar MH E4 in 1992 in its only agronomic evaluation. EL50 had greater than or equal resistance than the resistant checks in the 1997 Fort Collins, CO Cercospora evaluation and in the 1995 Betaseed Aphanomyces nursery at Shakopee, MN.